I pull most pictures I use while roleplaying primarily from google images, therefore who they exactly they belong to is usually unknown, since I have far more important things to worry about. Odds are, I'm using pictures taken by someone else, from someone else, and then there's a long change to the actual source. Yet again, this isn't of much consequence from me, since I'm only using the artwork/picture, not "stealing" it. When I say use it as "supplemental" material, I mean to use it only to enhance your writing, such as putting a picture of a location when you make a RP for instance. If this makes me a poor writer, then I don't really care, since I only do what I do for the enjoyment. I don't care and neither should any of you.